Stair for water



FIG. 1 is a left view of the device.

FIG. 2 is a right view of the device.

FIG. 3 is front view of the device.

FIG. 4 is a rear view of the device.

FIG. 5 is a top view of the device; and,

FIG. 6 is a bottom view of the device. 

The ornamental design for a stair for water, as shown and described. 